Ceramics-Silikáty 57, (1) 7 - 13 (2013)

The objective of this study was the preparation and characterization of high belite sulfoaluminate cement (HBSC) from industrial residues. HBSC promises eco-friendly building materials with great mechanical performance at earlier ages than Ordinary Portland Cement (OPC). Preliminary results show the formation of main phase dicalcium silicate (C₂S) and ye’elimite (C₄A₃$) at 1250^oC, as determined by X-ray diffraction (XRD), are promising. The formation of minerals in the clinker was analyzed by differential scanning calorimetry-thermogravimetry (DSC–TG). Likewise, Scanning electron microscope (SEM) and XRD were used to carry out the analysis of the micro-structural and hydration products. The main HBSC hydration products, Ettringite and amorphous Al(OH)₃, were formed in the early stages; however, during the later stages, monosulfate and Strätlingite were formed. Isothermal conduction calorimetry measurements indicate that hydration properties of the cements are comparable to OPC; the total hydration heat after 3 days was 438 J/g. The optimum compressive strength values of the mortars after 1-,3-,7-, and 28-days were 24.9 MPa, 33.2 MPa, 35.6MPa and 52.8 MPa which can meet the requirement of special structures.